Geometry Dash: Theory of SkriLLex (Demon) by Noobas (no copyright)
Oh my god, I just beat it and I am freaking out. As you probably know, I usually beat easy demons, but I just decided to beat a really hard one. The cube-ufo sequence at the beginning is pretty easy, just requires a bit of timing and memorization, but the dual cube is what you have to watch out for. I was able to master it, but it requires crucial memorization. Basically to prevent dying at 30% you have to jump early on the first set of yellow rings. Then comes lots and lots of easy memorization until you get to the triple speed wave. I am pretty good at the wave but it can be a problem if you suck at it :P. Then just don't get nervous near the end.
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Flaaroni presently has 19,860,266 views for Geometry Dash across 111 videos, with his channel uploading 20 hours worth of Geometry Dash videos. This is 88.61% of the total watchable video on Flaaroni's YouTube channel.